Product Description:

NOVITEC N-TRONIC Kit, Including: A power-optimized exhaust system made from high-grade stainless steel, without flap-regulation, and a catalyst-replacement pipe.

If you want to add flap-regulation to the exhaust (control the opening and closing of the valves) please quote the part number below:
Article no. F1 444 KL

Performance: 590 kW (802 hp) / 7.950 rpm
Max. torque: 898 Nm / 3.100 rpm